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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2833f3c2f5089bb5eff6e160aefc88272ca883749e05eb6d3bdddc43a1e835' 
  AND token = '9kK0IMKV2u+Cm+4o72Kn/ZzHkN/yxm8YYWX1gTX5GZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}